Maven ANTLR generating wrong directory - antlr4

Question

I have the following pom.xml:
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>db.project</groupId>
<artifactId>engine</artifactId>
<version>0.0.1-SNAPSHOT</version>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<antlr4.visitor>true</antlr4.visitor>
<antlr4.listener>true</antlr4.listener>
</properties>
<dependencies>
<dependency>
<groupId>org.antlr</groupId>
<artifactId>antlr4-runtime</artifactId>
<version>4.2</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<sourceDirectory>src</sourceDirectory>
<testSourceDirectory>test</testSourceDirectory>
<pluginManagement>
<plugins>
<plugin>
<groupId>org.antlr</groupId>
<artifactId>antlr4-maven-plugin</artifactId>
<version>4.0</version>
<configuration>
<sourceDirectory>src</sourceDirectory>
</configuration>
<executions>
<execution>
<goals>
<goal>antlr4</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</pluginManagement>
</build>
Normally, I use ANLTR 4 plugin which is described in this link : https://github.com/jknack/antlr4ide . But I want to use maven now, when I update my grammar in com.db.project directory, parser and lexer are generated in both default package (i.e., src/default package) and src/com/db/project/ twice, whereas I only want my lexer and parser in src/com/db/project/ directory. (including both .g4 file and java files in the same package)
How can I change this via pom.xml?

Answer 1

Simple change 4.0 to 4.2 in your antlr4-maven-plugin's version tag.
Note that the plugin will recursively scan src/main/antlr4 for .g4 grammar files. If your grammar resides in src/main/antlr4/com/company then the package of your generated parser/lexer files will be com.company.
Here's a small template project to get you started, in case you need it:
https://github.com/bkiers/antlr4-template